Right-wing groups like the English Defence League are turning parts of Britain into recruiting grounds for Islamic extremists, police have said.
The EDL emerged last year and has held demonstrations in a number of towns and cities against radicalisation.
But the West Midlands Counter Terrorism Unit has told BBC Radio 5 live there is evidence EDL events can encourage extremists.
Officers also say they are worried about radicalisation inside prisons.
Many EDL demonstrations and counter-demonstrations have ended in violence, and Det Supt John Larkin says they have witnessed signs of radicalisation afterwards.
“In some areas, we have evidence that once they have gone and the high-profile policing of the event has occurred, there’s fertile ground for those groups who would come in to encourage people to have this reality – this is the way white Western society sees us,” he said
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